EXTECH 42545 User Guide
User’s Manual
High Temperature InfraRed Thermometer
with Laser Pointer
MODEL 42545
Introduction
Congratulations on your purchase of the Model 42545A IR Thermometer. The 42545A is
capable of non-contact (infrared) temperature measurements at the touch of a butto n. The
built-in laser pointer increases target accuracy while the backlit LCD and handy pushbuttons combine for convenient, ergonomic operation. This meter is shipped fully tested
and calibrated and, with proper use, will provide years of reliable service.
Safety
• Use extreme caution when the laser pointer beam is on
• Do not point the beam toward anyone's eye or allow
the beam to strike the eye from a reflective surface
• Do not use the laser near explosive gases or in other
potentially explosive areas
Meter Description
1. Laser pointer beam
2. IR Sensor
3. Measurement Trigger
4. Battery and Switch Compartment
5. LCD Display
6. Push-buttons
7. Handle Grip
8. Temperature Units (ºC/ºF) Switch
9. Test Lock ON/OFF Switch
10. Alarm ON/OFF Switch
Note: There is a tripod mount on the bottom of the handle
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Operating Instructions
Basic IR Measurements
1. Hold the meter by its handle and point it toward the surface to be measured.
2. Pull and hold the trigger to turn the meter on and begin testing. The temperature
reading, the flashing ‘SCAN’ icon, the emissivity, and the unit of measure will appear.
Note: Replace the 9V battery if the display does not switch on.
3. Release the Trigger and the reading will hold for approximately 7 seconds (HOLD will
appear on the LCD) after which the meter will automatically shut off. The only
exception to this is if the TEST LOCK switch is set to ON.
Note: Select the temperature units (ºF/ºC) using the top switch inside the battery
compartment
Backlight/Laser Pointer
1. While pulling the Trigger, push the backlight/laser button once to turn on the
backlight.
2. Press it again to turn on the laser pointer. When the laser is ON the laser icon will
appear in the LCD.
3. Press the laser button to turn the backlight off.
4. Pressing it again turns the laser off.
Note: Backlight and Laser settings will be retained after the meter powers down.
Over-range Indication
If the temperature measurement exceeds the specified temperature range, the
thermometer will display dashes in place of a temperature reading.
High and Low Alarm Feature
The Model 42545a has an alarm feature whereas a High Alarm setting and a Low Alarm
setting can be programmed by the user. When either Alarm point is reached the meter will
alert the user via an audible beep and LCD display icon. Follow the steps below:
1. Press the MODE button until the HAL (High Alarm) parameter is displayed. Use the
UP and DOWN arrow keys to set the desired High Alarm temperature setting.
2. Press the MODE button until the LAL (Low Alarm) parameter is displayed. Use the
UP and DOWN arrow keys to set the desired Low Alarm temperature setting.
3. When an alarm limit is reached, the audible alarm will sound and the display icon
HIGH or LOW will appear on the LCD.
4. Note that if the bottom switch (located in the battery compartment) is set to OFF, the
audible alarm will be disabled.
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